Social media can be a double-edged sword for society, either as a convenient channel
exchanging ideas or as an unexpected conduit circulating fake news through a large population. …

Recent decades have seen a rise in the use of physics methods to study different societal
phenomena. This development has been due to physicists venturing outside of their traditional …

One-dimensional traffic flow is simulated by a cellular-automaton-type discrete model. As we
increase the car density, the model shows a phase transition between a jam phase and a …

By analyzing the foreign exchange market data of various currencies, we derive a hierarchical
taxonomy of currencies constructing minimal-spanning trees. Clustered structure of the …

We focus on Internet rumors and present an empirical analysis and simulation results of
their diffusion and convergence during emergencies. In particular, we study one rumor that …

Distribution functions of annual income of companies are analyzed based on two company
databases. A clear power law distribution consistent with the Zipf's law can be confirmed for …

A general discrete stochastic process involving random amplification with additive external
noise is analyzed theoretically and numerically. Necessary and sufficient conditions to realize …

Firms build business relationships during economic activities. The goal of this paper is to
clarify production mechanisms and economic functions by identifying characteristic patterns of …

We propose a new type of stochastic network evolution model based on annihilation,
creation, and coagulation of nodes, together with the preferential attachment rule. The system …

We introduce a novel description of the dynamics of the order book of financial markets as
that of an effective colloidal Brownian particle embedded in fluid particles. The analysis of …